Eighths to atkins stover



(No Model.) 2 Sheets-Sheet 1.

P. F. LENHART. OOMMUTATOR PATTERN.

No. 445,319. Patented Jan. 27, 1891.

m M M (No Model.)

2 Sheets-Sheet 2. P. F. LENHART. OOMMUTATOR PATTERN. No. 445,319. Patented Jan. 27, 1891.

hvenfa7t @222??? UNITED STATES PATENT OFFICE.

IIIIIIIP l IQEXIIART, OF BROOKLYN, NElV YORK, ASSIGNOR Oh SEVEN- EIGIlTl-IS TO ATKINS STOVER, OF SAME PLACE.

COMMUTATOR-PATTERN.

SPECIFICATION forming part of Letters Patent No. 445,819, dated January 27', 189] Application filed June 1'7, 1890.

Be it known that I, PHILIP F. LENHART, of Brooklyn, in the county of Kings and State of New York, have invented a certain new and useful Improvement in Patterns for Casting (Jommutators, of which the following is a specification.

My invention relates to an improvement in patterns for casting commutators, the object being to provide apattern by whiehthe several radial sections of a co mm ntator may be cast simultaneously and with accuracy, either with the insulating material between or a space for the reception of such material between them as may be found expedient.

In the accompanying drawings, Figure 1 represents an end view of the pattern. Fig. 2 represents a view of the same in side elevation, and Fig. represents a central longi tudinal section.

The pattern comprises a oylin drical body portion with tapered ends provided with wings radiating from itssurface and extending longitudinally thereof, the said wings correspond ing to the layers of insulating mz'iterial to be interposed between the several radial sections of the commutator.

In order to provide for the reception of the core, the pattern is provided at its opposite ends with core-prints, and for the purpose of uniting the several sections when east, so that they may be successfully withdrawn from the mold, the pattern is provided. with an annular ring at its upper and lower portions.

The particular construction of the pattern is as follows: A represents the cylindrical body portion of the pattern provided with tapering ends a, as shown. The angle of inclination of the tapered ends a is such as to afford a sliding bearing for the face of acap-screw (not shown) of the ordinary and well-known construction for binding the several radial sections of the commutator together when completed. At the ends of the tapered portion a core-prints B are secured. From the periphery of the cylindrical portion A wings O radiate. The wings C may either be secured to the surface of the body portion A and form in the mold a series of slots for the reception of thin layers of insulating material, extending from said Serial No, sown. (No model.)

from the remaining portion of tl1epattern,and

may be left in the mold when the other part of the pattern is withdrawn; or they may consist of insulating material detachable from the pattern, and may be left in the mold when the rest of the pattern is withdrawn, and when the casting is formed they will occupy their positions as insulating material between the several radial sections of the col'nmutator.

To provide for the uniting of the several sections of the casting when completed, and to further provide for asuitable flange around that end of the commutator toward the dynamo for the convenient attachment of the necessary wires, the pattern is provided with a flange E at one end extendingoutwardly from the body portion between the wings, and around the outside of the flange E, and, as herein shown, forming a part thereof, there is an annular ring portion 6, which circumscribes the outer edges of the several wingseetions of the pattern. There is also formed beneath the outer edge of the opposite end of the portion A an annular ring e, engaged with the body portion and forming a closure with the ends of the wings, and which maybe divided beneath the lower ends of the several wing portions, so as to admit of the body portion of the pattern being withdrawn, leaving the wing portion 0 in position, if desired.

I have used the term annular ring to describe the part c for the reason that in the completed casting the ring corresponding to c in the pattern will be acontinuous annular 5 ring uniting the ends of the several radial sections of the commutator, I am aware that when the said ring is divided by openings beneath the ends of the several radial rings it becomes a divided or segmental ring or an an- IOO nular series of ring-sections as distinguished from a continuous annular ring. When the pattern is constructed so that the wings are drawn together with the other parts, the ring 6 will be a continuous annular ring and will be drawn with the other parts. In forming the mold, when the radial wings are intended to be left therein and the ring 6' is for this purpose divided, the openings in the ring 6' below the ends of the radial wings will not be filled with sand, or at most only partially filled, leaving at all times a sufficient space in proximity to the ends of the radial wings to form a continuous annular ring in the casting. When the cap-screws of ordinary construction have been applied to the opposite ends of the castings and the several radial sections have been thereby secured, the rings 6 and e may be turned off, leaving the several radial sections of the commutator separated by the insulating material. It Will be observed that when it is desired toinsert the insulating material after the several sections of the com in utator are cast instead of before they are cast the Wings 0 act as chills and may be withdrawn, leaving spaces for the insulating material.

What I claim as my invention is- 1. Thepatternforcastingcommutators,coniprising a central body portion,wings extending longitudinally of and radiating from the central body portion, a flange extending outwardly from the body portion between the wings at one end, an annular ring forming a part of said flange in engagement with and ciroumscribing the extreme outer edges of the radial wings at said end, and a ring forming, in connection with the ends of the several wings, a closure at the opposite end of the pattern, substantially as set forth.

2. The pattern forcasting commutator-s, comprising the central body portion provided with wings radiating therefrom and detachable from the body portion, a flange extending outwardly from the body portion between the wingsat one end of the pattern,a ring there on surrounding the said flange and circum scribing the outer edges of the wings, and a segmental ring in contact with the ends of the wings at the opposite end of the pattern to form a closure therewith, the segmental ring being divided at points beneath the several radiating win gs, substantially as set forth.

I PHILIP F. LENHART.

Vt itn esses:

FREDK, HAYNES, K. E. PEMBLETON. 

